/Engine/Source/Editor/UnrealEd/Classes/MaterialEditor/DEditorMaterialLayersParameterValue.h
FMaterialLayersFunctionsare no longer treated as material parameters, so this should maybe be refactored at some point.
class UDEditorMaterialLayersParameterValue : public [UDEditorParameterValue](API\Editor\UnrealEd\MaterialEditor\UDEditorParameterValue)
FMaterialLayers...
ParameterValue